As you said midlength works very well for 14.5 to 16". There is some overlap since you can adjust timing, dwell and pulse intensity with many factors such as gas port size, position and bolt carrier/buffer reciprocating mass. Each manufacturer does it different and you can change some of the factors yourself.

KAC has an intermediate length gas system that works well for 18" or even 16". Rifle does well on 18" too. Mid might work but I'd go with a longer gas system.

I agree with mjkeat that a 14.5" midlength is ideal. But in the real world with legalities and for flexibility I went with a 16" midlength for my first build and did it again with my second (but this time with a lightweight barrel profile). I just don't want a pinned/welded muzzle device and when it comes down to it the actual differnece in length is barely an inch.

This SPR .223mm barrel is the product of the Army's Squad Designated Marksman Rifle Development Program, which was assigned the task of improving the accuracy of the standard issue rifle against targets out to 600 meters. This would allow the valued marksman or sniper the ability to stay concealed within the squad by carrying a weapon that looked similar to the rest. It was found that by carrying a dissimilar rifle, he had become an easily recognizable high-priority target. We offer this barrel to the tactical user or casual shooter interested in the ability hit distant targets with issued or mag length ammunition.

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We have been recommending White Oak for a couple of years now for accurate, varmint and "sniper support" style AR's. They are a great barrel, a very good company to deal with and their prices won't put you in the bread line.

I can recommend them without question for anyone who is building, or wanting to build, an accurate AR and can spend a few extra dollars on a really good barrel to complete the platform before optics.

Yeah, I'm really glad ya'll turn folks to White Oak. After first hearing of them here, I've spoke to some of the owners of the range and shop I frequent and they say the same. Shouldn't be more than a couple weeks before I have a range report.

The only thing is I only have one decent scope that's not in use. A Nikon Monarch 2.5-10 x 44mm. It's great and all, but I don't know if it'll be AR appropriate, unless I have an open style red-dot up top or something of the like? Of course I'm gonna try it out.

Yeah, I'm really glad ya'll turn folks to White Oak. After first hearing of them here, I've spoke to some of the owners of the range and shop I frequent and they say the same. Shouldn't be more than a couple weeks before I have a range report.

The only thing is I only have one decent scope that's not in use. A Nikon Monarch 2.5-10 x 44mm. It's great and all, but I don't know if it'll be AR appropriate, unless I have an open style red-dot up top or something of the like? Of course I'm gonna try it out.

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Whats wrong w/ that? I battled the, "must have BUIS and an offset RD," then came to the realization that the rifle is for range use so WTH

Then go w/ a 1.93 Larue mount. Theres another version but I cant think of the name at this time. I think its a 1.75 or something similar. The 1.93 will give you plenty of clearance but I think it changes your cheek weld a little. The next size shorter is a tight squeeze for gen 1 MBUS. The gen 2 and other brands should be fine.

I'm going to start saving for either a 1-4 or ? for the .300 blk on order. The size of the 1-4 is ideal but not sure its enough for hunting. Ive never hunted anything but birds so I'm clueless.